Hard rubber rod - Instrument's card

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Hard rubber rod

Dating

8 March 1940

Glass is not the only insulating material, but were also invented natural substances with interesting insulating characteristics and properties, such as hard rubber. The hard rubber was obtained by O. Meyer and T. Hancock in 1843 for prolonged vulcanization of the natural rubber in sulfur excess and with the addition of other minerals. Among its the various applications there is also the one as electrical insulator. In this case the rod was electrified by rubbing and it acquired a negative charge.

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Hard rubber rod

Cataloghi	Nº	Voce
Inv. 2016	493	Hard rubber rod Provisional numbering!
Inv. 1870	956	Bacchetta di ebanite

Section

Electrostatics

Window

Conditions

Complete

Working

Intact

Diameter	1.0 cm (0.4 in)
Height	30.0 cm (11.8 in)

Materials

Sources

Daguin P. A., Cours de physique élémentaire avec les applications a la météorologie , E. Privat, Toulouse, 1863, pag. 457, fig. 452
Resti E., Catalogo generale di apparecchi per l'insegnamento della fisica, Ditta Emilio Resti di Franco Brambilla, Pubblicazi, Milano, 1930, pag. 65, fig. 320

The additional indications which integrate the items of the conservation's state have the following meaning: (?) = maybe complete; M = maintenance; P = partial; R = restored; D = used for teaching; NC = not checked; X = impossible to verify.

In order to avoid that instruments' cards without the english description text of the device be directly selected, I added a special filter with which only the complete cards are shown in the menu. Anyhow all the partial english instruments' cards (with instrument's dating, dimensions, state of conservation...) can always be seen even if they haven't the english description text. To read this uncomplete cards is sufficient to click, for example, on an instrument's picture or on the word "View" of the table column called "Card" every time they appear in the other pages of this database.